Lock.



C. E. NORTHROP.

LOCK.

APPLICATION FILED FEB. 15. I915.

Patented July 30, 1918.

Fig.2.

IN VE IV TOR "burrs CHARLES EDGAR NORTHROP, OF DAYTON. OHIO.

LOCK.

Application filed February 15, 1918.

To all whom it may concern:

Be it known that 1, CHARLES; lflnoun Non- Tnnor, a citizen of the United States, and a resident of Dayton, in the county of Mont.- gomery and State of Ohio, have invented a new and Improved Lock, of which the following is a full, clear, and exact description.

This invention relates to locks, and has for an object the provision of an improved construction which involves the use of a key having a movable member positioned in a particular manner.

Another object in view is the provision of a lock with a bolt and associate parts so arranged that the key for operating the same must be of a certain length and must ex-' tend to a certain point.

A still further object of the invention is the provision of a simple construction in the lockin structure which utilizes a tapering keyhole and a movable member shifted to a correct position by the walls of the keyhole when the key is inserted.

In the accompanying drawing:

Figure 1 is a rear view of the lock disclosing an embodiment of the invention, part of the casing and also part of the lock being broken away for better illustrating the construction, said broken away portion be in approximately on line 11 of Fig. 5.

Fig. 2 is a view similar to Fig. 1, but showing the parts in their different or locked position with the key in place.

Fig. 3 is a view similar to Fig. 2, but with the key removed.

Fig. 4 is a sectional view through Fig. 1 on line Fig. 5 is a sectional view through Fig. 2 on line 55.

Fig. 6 is a detail perspective view of a key embodying certain features of the invention.

Fig. 7 is a fragmentary sectional View through a trunk showing a lock embodying the invention applied thereto.

Referring to the accompanying drawing by numerals, 1 indicates the front plate formed of metal or any desired material, through which the key tube 2 extends and to which it is preferably connected. If desired the tube 2 may merely extend to the surface or therebeyond, according to the particular use to which the lock is put. Mounted on the base plate 1 is a cover 3 having end flanges 4g and 5 through which screws 6 and 7 pass for securing the cover 3 to the base plate 1, Preferably the key tube 2 ex- Specification of Letters Patent.

Patented July 30, 1918.

Serial No. 217,294.

tends through the cover 3 as shown in Fig. 5 so as to allow a free action of the key 8. The lock may be used on trunks as shown in Fig. 7, or on boxes or any other desired article without departing from the spirit of the invention. When the lock is used on a trunk a suitable support 9 is provided which usually is in contact with the cover 3, while the base 1 may be connected by screws, rivets or otherwise to the body 10 of the trunk. The usual swinging tongue or hasp 11 is connected with the top of the trunk and the staple 13 is precisioned to enter the slot 14 in the bas plate 1 so as to have the bolt 15 of the lock project therethrough as shown.

in Fig. 3 when the lock has been operated or moved to a locked position. The staple .3 could be used on other devices in case the look was used on a box or for other purposes than a trunk without in any way departing from the spirit of the invention.

\Vi thin the cover 3 is a plate 16 which may be termed the bolt plate, as the same is provided with a projection forming the bolt 15. Said projection may be integral therewith,

or may be separate and rigidly secured.

thereto. The slot '17 between the bolt 15 and plate 1.6 allows a certain movement of plate 16 which movement is limited in one direction by the screw 18. The bolt plate 16 is provided with a here or opening whereby the plate is rotatably mounted on the tube 2, and if not prevented will freely rotate around said tube when properly moved. In order to limit the rotary movement of the bolt plate a screw 18 is provided. said screw extending to the base plate 1 and acting as a stop at the base of the bolt 15. The belt plate 16 is cut away at 19 so as to provide a shoulder 20 designed to strike the end 21 covered by plate 1. as shown in Fig. 4, thus stopping the rotary movement of the plate and also the bolt 15 after said bolt has been witlulrawn or moved away from the opening 14. A. shoulder 23 is provided near the base of the bolt 15 as shown in Fig. 1. which shoulder interlocks with the locking pawl 2=l for positively locking the bolt plate 16 and the b0lt'15 in their unlocked position as shown in Fig. 1. The pawl 21 is continually pressed by a spring 25 so as to normally remain in the position shown in Fig. 1, but capable of being moved therefrom by an appreciable pressure of the shoulder 23 against the pawl under the action of the key 8. When the key 8 moves the plate from the position shown in Fig. 1 to that shown in Figs. 2 and 3 the pawl 24 will drop automatically into the socket 26 and the end of the pawl will bear against the surface 27, thus locking plate 16 in a locked position and the bolt 15 in a projected position.

In order'to operate the parts the tumbler pawl 28 of key 8, as hereinafter fully described, projects through the slot 29 in the safety slide or plate 30 which is rotatably mounted on the tube 2. When the end of the tumbler pawl 28 extends through slot 29 and the key is turned in the right direction the tumbler pawl 28 will press against the concave surface of the locking pawl 24 and will raise the pawl until the lower end is engaging the surface 31 whereupon the end of the tumbler pawl 28 will move into the socket 26. When this has occurred the parts are inposition for a reverse or unlocking movement, as the key is turned in a reverse direction so as to move the parts from the position shown in Fig. 2 to that shown in :Fig. 1 the rotary movement of the key will cause the tumbler pawl 28 to move the plates 16 and 30 and consequently to withdraw the bolt 15 from the staple 13. As the plate 16 moves pawl 24 will gradually move to a position over the shoulder 23 for preventing any locking movement of bolt 15 until the key is again used. When the parts have reached the position shown in Fig. 1 the key is removed by an outward pull and as soon as the pawl 28 has been disengaged from the plate 16 plate 30 will move under the action of spring 35 until it strikes pin 22 so that the slot 29 and slot 26 will not be in registry. In order to limit the rotary movement of the safety slide or plate 30 said slide or plate is provided with a cut away portion 32 having shoulders 33 and 34 designed to engage, the pin 22. A spring 35 is connected with plate 30 and with a screw 7 36, said spring being normally under tension so as to normally cause the shoulder 34 to press against the pin 22. This spring assists the key 8 in returning the parts to their normal position as shown in Fig. 1, the pin 22 prevents unnecessary return movement. Preferably the notch 32 is of such a length that when the parts are moved to the position shown in Fig. 1 the tumbler pawl 28 holds the slot 29 in alinement with the socket 26. Upon the removal of the key 8 spring 35 moves the safety slot or plate 30 to the position shown in Fig. 3 and the slot 29 out of alinement with slot 26.

In forming the tube 2 the same is tapered interiorly and is provided with an opening 37 through which the tumbler pawl 28 proj ects when in operation and acts against the wall or shoulder portion 38. Key 8 may be provided with any suitable kind of body 39 having a ring or other suitable finger member 40, while at the end of body 39 a tubular structure 41 is provided having slots 42 and 43. The tumbler pawl 28 is substantially arc-shaped and is held in position by a pivotal pin 44. The size and the shape of the tumbler pawl 28 is such that the back 45 projects beyond slot 42 when the operating end 46 is substantially flush with the outer surface of the tubular end section 41. In view of this fact and the tapering of the tube 2 when the parts are in the position shown in Fig. 6 and the key is inserted the back will act to engage the tapering key opening or keyway provided by tube 2 and be moved to the position shown in Fig. 4. A continued inward movement of the key from the position shown in Fig. 4 to that shown in Fig. 5 will cause the tumbler pawl 28 to move to an upward position for engaging the plate 30 in slot 29 and also to a position for fitting into socket 26. When the key is first inserted it will strike the slot 29 or the surface of the plate 30, and if the latter occurs it is necessary to move the key back and forth slightly until the tumbler 'pawl is projected into the slot 29 after which the key and plate 30 are rotated until the key is again projected forwardly and thence into the socket 26, the tumbler pawl 28 having previously forced the locking pawl 24 therefrom. When the parts are in the position just described, and as shown in Fi 1, the key is in position for moving the olt, which movement occurs if the key is turned to the position indicated by the arrow shown in Fig. 1. After the parts are moved to the position shown in Fig. 2 the key is then bodily withdrawn by an outward pull, said withdrawal movement causing the tumbler pawl to fold back into the tubular portion 41 in the key 8. As soon as the tumbler pawl has been removed from the slot 29 and the socket 26 pawl 24 will automatically move into socket 26 under the action of spring 25 and the plate 30 will return to its pawl 28 to press against the walls of socket 26 and thereby rotate the plate 26 and bolt 15, said rotation causing the cam surface 31 to press against pawl 24 for raising the same until the bolt snaps from the shoulder 23.

After the bolt has been withdrawn the key is then pulled out.

In order to properly hold the plate 30 and also plate 16 and associate parts in position a bracket 47 is provided which is'rigidly secured to plate 1 and which has provided an encircling section 48 encircling the tube 2.

lVhat I claim is:

l. A look comprising a casing, a tubular member arranged in said casing having a tapering tubular member, and an opening in one side, a locking bolt formed with a notch, and a key having a pivotally mounted tumbler formed substantially arc-shaped so as to engage the walls of said tapering tubular member as it is inserted whereby the pivotally mounted tumbler is forced through the opening in said tubular member to a position whereby it may be forced into said notch when the key is turned in order to shift the position of said bolt.

2. A lock of the character described com prising a base plate, a covering therefor, a tubular member extending through said cover and said base plate, said base plate having an opening, a bolt formed with a plate rotatably mounted on said tubular member so that the bolt will be capable of movement past said opening, a projecting plate rotatably mounted on said tubular member on top of said first mentioned plate, said first mentioned plate being formed with a notch and said second mentioned plate being provided with a slot, and a key formed with a movable tumbler member for engaging said slot and said notch after a movement of the plate so as to shift the position of said bolt to and from the position over the opening in said base.

3. A lock comprising a casing having an opening for receiving a staple structure, a tubular member extending through the casing, said tubular member being tapered interiorly and provided with a slot opening into the casing, a bolt adapted to be moved across the opening in the casing so as to be thrust through said staple, a plate connected with said bolt, said plate being rotatably mounted on said tubular member, said plate also being formed with a key receiving notch, a second plate 'rotatably mounted on said tubular member above the first mentioned plate, said second mentioned plate having a slot, and a key provided with a pivotally mounted pawl adapted to fit into the slot in said second plate and when the second mentioned plate has been moved a predetermined distance to tit into said notch in the first mentioned plate for moving said bolt, said key having a tubular body provided with slots in opposite sides, said pawl being substantially arc-shaped and pivotally Copies of this patent may be obtained for mounted in the tubular portion of the key so that the back of the pawl will strike against the tapering walls of the tubular member as the key is inserted so that the free end of the pawl will pass through the opening in the tubular member and into the slot in said plate.

l. In a lock of the character described, a locking mechanism including a bolt and a tapering tube acting as a key hole, and a key formed with a body and a pivotally mounted tumbler pawl formed arc-shaped and pivotally mounted on the body the shape of the pawl causing the back thereof to strike against said tube as the key is inserted and thereby swing the pawl toward said locking mechanism so as to interlock therewith for actuating the same when the key is rotated.

5. A lock oi the character described comprising a locking mechanism including a bolt and a tapering tube, round in cross section, formed with a slot adjacent said bolt, and a key having an end section provided with slots, and a pivotally mounted tumbler pawl arranged in said end section, said pawl being are-shaped so that the point will fit in one of said slots while the back will fit in the opposite slot and extend slightly therebeyond whereby when the key is inserted in the tube the back of the pawl will strike the tapering wall of the tube and force the point through the opening in the tube and into engagement with the locking mechanism so that when the key is turned the bolt will be forced to a locked or unlocked position according to the direction of the movement of the key.

6. A look of the character described comprising a locking mechanism including a bolt, a tube having a tapering bore acting as a keyhole, said tube being formed with an opening adjacent said bolt, and a key provided with a slotted section, and a tum hler pawl pivotally mounted in said slotted section, said tumbler pawl being arc-shaped in order that the back thereof may strike the walls of said tube so as to be forced through said slotted section to a predetermined extent as the key is inserted and forced through said slotted, section to a greater extent by the action of one of the walls of the opening in the tube so as to engage said locking structure preparatory to shifting said bolt.

CHARLES EDGAR NORTHROP.

five cents each, by addressing the "Commissioner of Patents, Washington, D. 0. 

